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<!DOCTYPE html>
<title>Element.getElementsByClassName</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
test(function() {
var a = document.createElement("a"), b = document.createElement("b")
b.className = "foo"
a.appendChild(b)
var list = a.getElementsByClassName("foo")
assert_array_equals(list, [b])
var secondList = a.getElementsByClassName("foo")
assert_true(list === secondList || list !== secondList, "Caching is allowed.")
}, "getElementsByClassName should work on disconnected subtrees.")
test(function() {
var list = document.getElementsByClassName("foo")
assert_false(list instanceof NodeList, "NodeList")
assert_true(list instanceof HTMLCollection, "HTMLCollection")
}, "Interface should be correct.")
test(function() {
var a = document.createElement("a");
var b = document.createElement("b");
var c = document.createElement("c");
b.className = "foo";
document.body.appendChild(a);
this.add_cleanup(function() {document.body.removeChild(a)});
a.appendChild(b);
var l = a.getElementsByClassName("foo");
assert_true(l instanceof HTMLCollection);
assert_equals(l.length, 1);
c.className = "foo";
a.appendChild(c);
assert_equals(l.length, 2);
a.removeChild(c);
assert_equals(l.length, 1);
}, "getElementsByClassName() should be a live collection");
</script>
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